Question about Hyundai Sonata

1 Answer

Hyundia sonata glx auto 1997cc. 1996 model year. approx 53000 miles Engin starts and reves up to about 2000 + rpm then after a short time may be a miniut drops back to 900 to 1000 but surges to 1500 every 5 to 10 sec's. In drive it smooths out a bit but still runs on the high side, back in N or P it surges again. This has happened on one or two occations in the past but only when the battery had gone flat. it has had a new alternator and battery about 2500 miles ago. The only other things done recently are replacement, of leaking power stearing cooler unit in front of raidator, front pads replaced, and rear drums cleaned, and the air cleaner inspected but not renewed. The car has been laid up for the last four months but started up regulary with no problems. This has only ocured since the breaks were serviced three days ago.

Posted by on

  • Thank you for the reply which I have found good and clear. I checked out the idle air bleed but there is very little or nearly no change to the revs when trying adjustmet. I have not yet checked the water supply and will do this soon ( am away at the moment ). I did not find any air leaks or loose connections in fact whent over all involved with the area and took off and reseated them.
    There was one which, when the engine was running, I took off and the revs increased to about 2500 and when I replaced the plug they returned to the surge cycle.
    This was a single wire into a terminal just by the idle screw a little to the left and back.
    I will keep you posted when I look more.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 184 Answers

The surge is caused by a high idle situation where the computer pulls it down but it goes back up again,hence the surge.Hopefully it is just pure bad timing that it played up after the brakes being done as nothing needs to be disturbed by it.One came into my shop like this and the idle air bleed had been tampered with.this is located on the throttle body(this is where your accelerator cable goes to).It should have a black rubber plug in it about the diameter of an aaa or aa battery end.remove this(some are already missing),inside this is a flat screw type head.Using the right size screwdriver slowly turn this clockwise while the engine is running in park.You should only have to turn this 1/2 to 1 turn in to alter the idlespeed.if no change or it slows then surges again,we will have to check some other areas.Also check your coolant level in your radiator,as these have 2 small hoses that feed coolant through the throttle body,this can give same symptons.There are a few other things to check but at this stage just check these 2 items and of course look for any hoses or sensor plugs that are not on,or any loud hissing of air escaping anywhere.Hope this helps.

Posted on Mar 22, 2011

  • Peter da techmen Mar 27, 2011

    I looked back through my files,have had several of these and mitsubishi models in with these symptoms.It was a stuck stepper motor.Some had to be replaced,but two were repaired by removing and cleaning out with a solvent cleaner like carby cleaner.
    This little unit bolts onto the manifold,usually on the throttle body or near to it.As the name suggests it regulates the idle speed in steps,but sometimes carbon build up inside causes the blade to jam open holding the idle up,with the cars computer trying to drop rpm by adjusting fuel delivery.this is the should have a 3 or 4 wire plug to it and be secured to the manifold or t/body by 2 small bolts or screws diagonally.While cleaning here,remove the air duct from the air cleaner to the throttle body.Open the throttle by hand and spray cleaner inside the throttle body and butterfly until clean.
    After replacing everything.When you go to start the vehicle treat like a flooded fuel system,hold the gas pedal to the floor while cranking and dont lift off until it fires up and revs up on all 4 cylinders.This will ensure that all the cleaning solvent and dirt dislodged gets burnt out and the sparkplugs dont foul.
    Hope this time we have nailed it for you.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Dodge drango 2000 will not idle in cold weather until warmed-up

I would test, or replace my IAT sensor . (Intake air temperature sensor)
If it's defective, it will send wrong signal, thus wrong mixture for cold engine.

Mar 29, 2013 | 2000 Dodge Durango

1 Answer

99 hyundia sonata has 95000 miles has check engine I need advise

Go to a local auto parts satire and ask them to read the code to you if the code is over 999 then you will have to go to a dealer to review it. If your car hasn't seemed to change in overal performance it probably somthing really simple like a sensor or something!

Nov 17, 2011 | 1999 Hyundai Sonata

2 Answers

Timing belt replacement interval

My rule of thumb for Timing belts:
replace at 60,000 miles, and every 40,000 miles thereafter. Having said that, I often let
cars go until the timing belt starts showing signs of wear (usually every 50K - 75K miles)

But (register free at is recommending for your
car driving in "severe driving conditions" (aka normal stop-start driving) that your 2000 Sonata
60,000 miles - replace
90,000 miles - inspect for wear
120,000 miles - replace
150,000 miles - inspect for wear

The 155 page owners manual (I found one at the link below - you may prefer to try Hyundai)
makes no mention of the timing belt at all.

Jan 02, 2011 | 2000 Hyundai Sonata

3 Answers

53000 miles, check engine light came on. The car is running fine.

To be on the save side go to any auto parts or some one like autozone and they will pull code's from your computer for free, get back with us with the code number so we can help you diag. your trouble code.

Jun 29, 2010 | 2006 Hyundai Sonata

1 Answer

MSD for Hyundai Sonata GLS 1992 16V DOHC

Hi;I live in Iran and I have a Hyundai Sonata GLS 1993 4cyls 1997cc 16V DOHC(G4CP Engine type) and I want to install an ecu 39110-33150 for care

Feb 26, 2010 | 1992 Hyundai Sonata

1 Answer

Noises coming from th left frontwheel of my 2000 hyundia sonota could this be a hub and bearing noise

What kind of noises are you hearing? Most likely, you need to replace the brakes. It is very unusual for a 10 year old car to have wheel bearing problems, especially on the front wheels.

A squeal when you apply the brakes or a grinding/dragging noise while you are driving are signs that it is time to replace the brakes.

Jan 30, 2010 | 2000 Hyundai Sonata

1 Answer

My sonata 2001 v6 automatic won't rev past 4000 rpm by any way (idle or by driving) sometimes will shut after trying reving by full throttling. The only code output to my code reader is u0000 and no check...

I would replace the fuel filter(every 35000 miles),check the condition of the air filter and check out the catalitic converter and feel the tail pipe to see if the flow seems clogged and weak when some one else gives it the gas.
My 2001 had to have a new cat at only 44000 miles. I had them install a "High Flow" type.

Oct 30, 2009 | 2001 Hyundai Sonata

1 Answer

Hyundia sonata 1996 wont start

factory immobiliser has cut in .NO YOU CANT BYPASS IT ,well not very easily

Mar 23, 2009 | 1996 Hyundai Sonata

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

152 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hyundai Experts


Level 3 Expert

80637 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8841 Answers

Are you a Hyundai Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides